[Updated] Sagenb via Simple Sage Server API

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There isn't a way to do this with the simple server API. Basically, when you create a session with the simple server API, it creates a new worksheet behind the scene that you interact with. So, you can't do things like access objects in memory for another running worksheet, etc. If you really want to, you could play around directly with the worksheet paths and access files that are produced, but this is probably a bit more low-level than what you had in mind.